JP2012228122A - Non contact power supply device - Google Patents

Non contact power supply device Download PDF

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JP2012228122A
JP2012228122A JP2011095342A JP2011095342A JP2012228122A JP 2012228122 A JP2012228122 A JP 2012228122A JP 2011095342 A JP2011095342 A JP 2011095342A JP 2011095342 A JP2011095342 A JP 2011095342A JP 2012228122 A JP2012228122 A JP 2012228122A
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power
coil
foreign matter
power transmission
power supply
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JP5768464B2 (en
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Hiroshi Tanaka
広志 田中
Junichi Hasegawa
淳一 長谷川
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Nissan Motor Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a non contact power supply device which detects a foreign object entering between a power supply coil and a power reception coil.SOLUTION: A non contact power supply device includes: a second coil conducting contactless power transmission or contactless power reception with a first coil through at least magnetic coupling; a passage 171 provided on a facing surface of the second coil which faces the first coil; temperature detection means detecting a temperature of a refrigerant passing through the passage 171; and foreign object detection means detecting a foreign object between the first coil and the second coil on the basis of the detected temperature detected by the temperature detection means.

Description

本発明は、非接触給電装置に関するものである。   The present invention relates to a non-contact power feeding device.

送電手段と、前記送電手段からの電力を非接触で受ける受電手段と、前記送電手段と前記受電手段間の伝送効率を検出する効率検出手段と、検出した前記伝送効率が規定値以上であるか否かを判定する判定手段と、前記伝送効率が前記規定値未満である場合に、障害物などにより正常な給電が妨げられたものと判定し、前記送電手段による送電を一時的に中止し、規定時間後に微小電力による送電を再開する制御手段と、を有する給電システムが知られている(特許文献1)。   A power transmission means, a power reception means for receiving power from the power transmission means in a non-contact manner, an efficiency detection means for detecting a transmission efficiency between the power transmission means and the power reception means, and whether the detected transmission efficiency is a specified value or more. When the determination means for determining whether or not the transmission efficiency is less than the specified value, it is determined that normal power supply is hindered by an obstacle, etc., and the power transmission by the power transmission means is temporarily stopped, There is known a power feeding system including a control unit that resumes power transmission using minute power after a specified time (Patent Document 1).

特開2010−119246号公報JP 2010-119246 A

しかしながら、伝送効率は、送電コイルと受電コイルとの間に位置ズレが生じた場合にも下がるため、伝送効率の変化からは、送電コイルと受電コイルとの間に混入された異物を検出することができなかった。   However, since the transmission efficiency also decreases when a positional deviation occurs between the power transmission coil and the power reception coil, foreign matter mixed between the power transmission coil and the power reception coil is detected from the change in transmission efficiency. I could not.

本発明が解決しようとする課題は、給電コイルと受電コイルとの間に混入された異物を検出する非接触給電装置を提供することである。   The problem to be solved by the present invention is to provide a non-contact power feeding device that detects foreign matter mixed between a power feeding coil and a power receiving coil.

本発明は、第1のコイルと対向する第2のコイルの対面側に設けられた流路と、流路内を通る冷媒の温度を検出する温度検出手段と、温度検出手段により検出された検出温度に基づいて、第1のコイルと第2のコイルとの間に混入された異物を検出する異物検出手段とを備えることによって、上記課題を解決する。   The present invention relates to a flow path provided on the opposite side of the second coil facing the first coil, temperature detection means for detecting the temperature of the refrigerant passing through the flow path, and detection detected by the temperature detection means. The above-described problem is solved by providing a foreign matter detection unit that detects foreign matter mixed between the first coil and the second coil based on the temperature.

本発明によれば、異物が第1のコイルと第2のコイルとの間に混入された場合には、当該異物から発せられる熱が流路内を通る冷媒に伝わるため、流路内の冷媒の温度を検出することにより、当該異物を検出することができる。   According to the present invention, when the foreign matter is mixed between the first coil and the second coil, the heat generated from the foreign matter is transferred to the refrigerant passing through the flow passage. The foreign matter can be detected by detecting the temperature.

本発明の実施形態に係る非接触充電システムのブロック図である。1 is a block diagram of a non-contact charging system according to an embodiment of the present invention. 図1の非接触充電システムに含まれる送電ユニット及び冷却装置の平面図である。It is a top view of the power transmission unit and cooling device which are included in the non-contact charge system of FIG. 図2のIII線に沿う断面図である。It is sectional drawing which follows the III line of FIG. 送電コイルと受電コイルとの間に異物が存在する状態を説明するための図であり、非接触充電システムに含まれる送電ユニット及び冷却装置の平面図である。It is a figure for demonstrating the state in which a foreign material exists between a power transmission coil and a receiving coil, and is a top view of the power transmission unit and cooling device which are included in a non-contact charging system. 図1の非接触充電システムに含まれる非接触給電装置の制御手順を示すフローチャートである。It is a flowchart which shows the control procedure of the non-contact electric power feeder included in the non-contact charging system of FIG. 本発明の他の実施形態に係る非接触充電システムに含まれる送電ユニット及び冷却装置の平面図である。It is a top view of the power transmission unit and cooling device which are included in the non-contact charge system concerning other embodiments of the present invention. 本発明の他の実施形態に係る非接触充電システムに含まれる、非接触給電装置の制御手順を示すフローチャートである。It is a flowchart which shows the control procedure of the non-contact electric power feeder included in the non-contact charging system which concerns on other embodiment of this invention.

以下、本発明の実施形態を図面に基づいて説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

《第1実施形態》
図1は、本発明の一実施形態に係る非接触給電装置を含む車両200及び充電装置100を備えた非接触充電システムのブロック図である。なお、本例の非接触給電装置の車両側のユニットは電気自動車に搭載されるが、ハイブリッド車両等の車両でもよい。
<< First Embodiment >>
FIG. 1 is a block diagram of a contactless charging system including a vehicle 200 including a contactless power feeding device and a charging device 100 according to an embodiment of the present invention. In addition, although the vehicle side unit of the non-contact electric power feeder of this example is mounted in an electric vehicle, vehicles, such as a hybrid vehicle, may be sufficient.

図1に示すように、本例の非接触充電システムは、車両側のユニットを含む車両200と、地上側ユニットである充電装置100とを備え、給電スタンドなどに設置される充電装置100から、非接触で電力を供給し、車両200に設けられるバッテリ22を充電するシステムである。   As shown in FIG. 1, the non-contact charging system of this example includes a vehicle 200 including a vehicle-side unit and a charging device 100 that is a ground-side unit. From the charging device 100 installed in a power supply stand or the like, In this system, electric power is supplied in a non-contact manner and a battery 22 provided in the vehicle 200 is charged.

充電装置100は、交流電源11と、送電回路部12と、通信部13と、位置検出部14と、給電制御部15と、送電コイル16と、冷却装置17とを備えている。充電装置100は、車両200を駐車する駐車スペースに設けられており、車両200が所定の駐車位置に駐車されるとコイル間の非接触給電により電力を供給する地上側のユニットである。   The charging device 100 includes an AC power supply 11, a power transmission circuit unit 12, a communication unit 13, a position detection unit 14, a power supply control unit 15, a power transmission coil 16, and a cooling device 17. The charging device 100 is provided in a parking space where the vehicle 200 is parked, and is a ground-side unit that supplies power by non-contact power feeding between coils when the vehicle 200 is parked at a predetermined parking position.

送電回路部12は、交流電源11から送電される交流電力を、高周波の交流電力に変換し、送電コイル16に送電するための回路であり、給電制御部15の制御により、送電コイル16から送電される電力を制御する制御回路である。通信部13は、車両200側の通信部23との間で、無線により通信を行い、情報の送受信を行う。通信部13は、例えば、充電装置100からの電力供給を開始する旨の信号を通信部23に送信したり、あるいは、車両200側から充電装置100から電力を受給したい旨の信号を通信部23を介して受信したりする。位置検出部14は、充電装置100に設けられる送電コイル16の設置位置に対して、所定の駐車位置に駐車しようとする車両200の受電コイル26の位置を周期的に検出する。位置検出部14は、例えば、赤外線信号又は超音波信号等の信号を発信し、当該信号の変化から位置を検出する。   The power transmission circuit unit 12 is a circuit for converting AC power transmitted from the AC power source 11 into high-frequency AC power and transmitting the power to the power transmission coil 16. Power transmission from the power transmission coil 16 is controlled by the power supply control unit 15. It is the control circuit which controls the electric power which is done. The communication unit 13 communicates wirelessly with the communication unit 23 on the vehicle 200 side to transmit and receive information. For example, the communication unit 13 transmits a signal indicating that power supply from the charging device 100 is started to the communication unit 23 or a signal indicating that power is to be received from the charging device 100 from the vehicle 200 side. Or receive via. The position detection unit 14 periodically detects the position of the power reception coil 26 of the vehicle 200 that is to be parked at a predetermined parking position with respect to the installation position of the power transmission coil 16 provided in the charging device 100. For example, the position detection unit 14 transmits a signal such as an infrared signal or an ultrasonic signal, and detects the position from the change of the signal.

給電制御部15は、送電回路部12、位置検出部14及び通信部13を制御することで、充電装置100を制御する。給電制御部15は、送電回路部12を制御して、送電コイル16から受電コイル26に出力される電力等を制御する。給電制御部15は、充電に関する制御信号を、通信部13から通信部23に送信し、位置検出部14を制御して、送電コイル16に対する受電コイル26の相対的な位置を検出する。また、給電制御部15には、異物検出部151が含まれている。なお、異物検出部151については後述する。   The power supply control unit 15 controls the charging device 100 by controlling the power transmission circuit unit 12, the position detection unit 14, and the communication unit 13. The power supply control unit 15 controls the power transmission circuit unit 12 to control the power output from the power transmission coil 16 to the power reception coil 26. The power supply control unit 15 transmits a control signal related to charging from the communication unit 13 to the communication unit 23 and controls the position detection unit 14 to detect the relative position of the power reception coil 26 with respect to the power transmission coil 16. Further, the power supply control unit 15 includes a foreign object detection unit 151. The foreign object detection unit 151 will be described later.

送電コイル16は、本例の非接触給電装置を設けた駐車スペースに設けられている。非接触充電システムのうち車両200側ユニットを備えた車両200が所定の駐車位置に駐車されると、送電コイル16は、受電コイル26の下部であり、受電コイル26と距離を保って、位置づけられる。送電コイル16は、駐車スペースの表面と平行な円形形状のコイルである。冷却装置17は、送電コイル16を冷却するための装置である。   The power transmission coil 16 is provided in a parking space where the non-contact power feeding device of this example is provided. When the vehicle 200 provided with the vehicle 200 side unit in the non-contact charging system is parked at a predetermined parking position, the power transmission coil 16 is positioned below the power reception coil 26 and is positioned at a distance from the power reception coil 26. . The power transmission coil 16 is a circular coil parallel to the surface of the parking space. The cooling device 17 is a device for cooling the power transmission coil 16.

車両200は、受電回路部21と、バッテリ22と、通信部23と、インバータ24と、充電制御部25と、受電コイル26と、モータ27と、EVコントローラ28とを備えている。受電コイル26は、車両200の底面(シャシ)等で、後方の車輪の間に設けられている。そして当該車両200が、所定の駐車位置に駐車されると、受電コイル26は、送電コイル16の上部であり、送電コイル16と距離を保って、位置づけられる。受電コイル26は、駐車スペースの表面と平行な円形形状のコイルである。受電回路部21は、受電コイル26により受電された交流電力を直流電力に整流する整流回路と、当該整流回路で整流された直流電力をバッテリ22の充電に適した直流電力に変換するDC−DC変換回路とを含んでいる。また受電回路部21には、バッテリ22と、受電コイル26とを切り離すためのスイッチを含むジャンクションボックス(図示しない)が含まれており、当該ジャンクションボックスは、充電制御部25により制御される。   The vehicle 200 includes a power receiving circuit unit 21, a battery 22, a communication unit 23, an inverter 24, a charging control unit 25, a power receiving coil 26, a motor 27, and an EV controller 28. The power receiving coil 26 is provided between the rear wheels on the bottom surface (chassis) of the vehicle 200. When the vehicle 200 is parked at a predetermined parking position, the power receiving coil 26 is located above the power transmission coil 16 and is positioned at a distance from the power transmission coil 16. The power receiving coil 26 is a circular coil parallel to the surface of the parking space. The power receiving circuit unit 21 rectifies the AC power received by the power receiving coil 26 into DC power, and DC-DC that converts the DC power rectified by the rectifying circuit into DC power suitable for charging the battery 22. Conversion circuit. The power receiving circuit unit 21 includes a junction box (not shown) including a switch for disconnecting the battery 22 and the power receiving coil 26, and the junction box is controlled by the charge control unit 25.

バッテリ22は、複数の二次電池を接続することで構成され、車両200の電力源となる。インバータ24は、IGBT等のスイッチング素子を有したPWM制御回路等の制御回路であって、コントローラ28によるスイッチング制御信号に基づいて、バッテリ22から出力される直流電力を交流電力にし、モータ27に供給する。モータ27は、例えば三相の交流電動機により構成され、車両200を駆動させるための駆動源となる。   The battery 22 is configured by connecting a plurality of secondary batteries, and serves as a power source for the vehicle 200. The inverter 24 is a control circuit such as a PWM control circuit having a switching element such as an IGBT. The inverter 24 converts the DC power output from the battery 22 into AC power based on a switching control signal from the controller 28 and supplies the AC power to the motor 27. To do. The motor 27 is composed of, for example, a three-phase AC motor and serves as a drive source for driving the vehicle 200.

通信部23は、地上側の通信部13と、無線により通信を行い、情報の送受信を行う。充電制御部25は、充電時に、受電回路部21、バッテリ22及び通信部23を制御する。また充電制御部25は、コントローラ28とCAN通信網で接続され、制御信号の送受信を行う。また充電制御部25は、通信部13及び通信部23を介して、給電制御部15と充電に関する制御信号の送受信を行い、本例の非接触給電装置を制御する。充電制御部25は、充電する際には、受電回路部21に含まれるジャンクションボックスを制御し、受電コイル26から受電回路部21を通りバッテリ22まで導通させて、送電コイル16から送電される電力をバッテリ22に供給することで、バッテリ22を充電する。   The communication unit 23 communicates with the communication unit 13 on the ground side wirelessly to transmit and receive information. The charging control unit 25 controls the power receiving circuit unit 21, the battery 22, and the communication unit 23 during charging. The charging control unit 25 is connected to the controller 28 via a CAN communication network, and transmits and receives control signals. In addition, the charging control unit 25 transmits and receives a control signal related to charging with the power supply control unit 15 via the communication unit 13 and the communication unit 23, and controls the non-contact power supply apparatus of this example. When charging, the charging control unit 25 controls the junction box included in the power receiving circuit unit 21, conducts electricity from the power receiving coil 26 through the power receiving circuit unit 21 to the battery 22, and is transmitted from the power transmitting coil 16. Is supplied to the battery 22 to charge the battery 22.

コントローラ28は、車両200全体を制御する制御部である。コントローラ28は、運転手のアクセル操作に基づくアクセル開度及び車速等に基づいてトルク指令値を設定し、インバータ24のスイッチング制御を行うことで、バッテリ22の電力でモータ27を駆動させる。またコントローラ28は、充電を開始するための信号を充電制御部25に送信し、充電制御部25を制御する。コントローラ28は、バッテリ22の充電状態(SOC)を管理する。そして、コントローラ28は、バッテリ22の充電中、バッテリ22のSOCに基づいて満充電に達した場合には、充電ための制御信号を充電制御部25に送信し、当該制御信号を通信部23を介して給電制御部15に送信し、充電を終了させる。   The controller 28 is a control unit that controls the entire vehicle 200. The controller 28 sets the torque command value based on the accelerator opening and the vehicle speed based on the driver's accelerator operation, and controls the inverter 24 to drive the motor 27 with the electric power of the battery 22. Further, the controller 28 transmits a signal for starting charging to the charging control unit 25 to control the charging control unit 25. The controller 28 manages the state of charge (SOC) of the battery 22. When the battery 28 is fully charged based on the SOC of the battery 22 during charging of the battery 22, the controller 28 transmits a control signal for charging to the charge control unit 25, and sends the control signal to the communication unit 23. To the power supply control unit 15 to terminate the charging.

そして、本例の非接触給電装置では、送電コイル16と受電コイル26との間で、電磁誘導作用により非接触状態で高周波電力の送電及び受電を行う。言い換えると、送電コイル16に電圧が加わると、送電コイル16と受電コイル26との間には磁気的な結合が生じ、送電コイル16から受電コイル26へ電力が供給される。   And in the non-contact electric power feeder of this example, between the power transmission coil 16 and the receiving coil 26, high frequency electric power transmission and reception are performed in a non-contact state by electromagnetic induction action. In other words, when a voltage is applied to the power transmission coil 16, magnetic coupling occurs between the power transmission coil 16 and the power reception coil 26, and power is supplied from the power transmission coil 16 to the power reception coil 26.

次に、図2及び図3を用いて、送電ユニット30及び冷却装置17の構成を説明する。図2は本例の非接触給電装置の送電ユニット30及び冷却装置17の平面図であり、図3は図2のIII線に沿う断面図である。なお図2の矢印は、後述する流路171を流れる流体の流れる向きである。   Next, the structure of the power transmission unit 30 and the cooling device 17 is demonstrated using FIG.2 and FIG.3. FIG. 2 is a plan view of the power transmission unit 30 and the cooling device 17 of the non-contact power feeding device of this example, and FIG. 3 is a cross-sectional view taken along line III of FIG. In addition, the arrow of FIG. 2 is the direction through which the fluid which flows through the flow path 171 mentioned later flows.

本例の非接触給電装置は、送電ユニット30を備え、送電ユニット30は、所定の駐車スペースの地上に設けられている。車両200が、本例の非接触給電装置による充電に適した位置である、所定の駐車スペースに駐車されると、送電ユニット30が車両200の後輪の間に位置づけられる。送電ユニット30は、送電コイル16と、冷却装置17の一部である流路171と、フェライトコア31と、磁気遮蔽板32と、保護部材33とを備えている。冷却装置17は、流路171と、サーミスタ172と、サーミスタ173と、流量計174と、ポンプ175と、熱交換器176とを備えている。   The non-contact power feeding device of this example includes a power transmission unit 30, and the power transmission unit 30 is provided on the ground of a predetermined parking space. When the vehicle 200 is parked in a predetermined parking space, which is a position suitable for charging by the contactless power supply device of this example, the power transmission unit 30 is positioned between the rear wheels of the vehicle 200. The power transmission unit 30 includes a power transmission coil 16, a flow path 171 that is a part of the cooling device 17, a ferrite core 31, a magnetic shielding plate 32, and a protection member 33. The cooling device 17 includes a flow path 171, a thermistor 172, a thermistor 173, a flow meter 174, a pump 175, and a heat exchanger 176.

送電コイル16は、高周波電力を通すように、リッツ線で構成されており、送電コイル16のコイル面が、地面と平行になるように配置されている。車両200が所定の駐車スペースに駐車されると、受電コイル26は送電コイル16と臨む位置に配置され、送電コイル16と受電コイル26とが対向する。言い換えると、送電コイル16の上面が、受電コイル26と対向する送電コイル16の対向面となり、受電コイル26の下面が、送電コイル16と対向する受電コイル26の対向面となる。   The power transmission coil 16 is composed of a litz wire so as to pass high-frequency power, and the coil surface of the power transmission coil 16 is arranged in parallel with the ground. When the vehicle 200 is parked in a predetermined parking space, the power reception coil 26 is disposed at a position facing the power transmission coil 16, and the power transmission coil 16 and the power reception coil 26 face each other. In other words, the upper surface of the power transmission coil 16 is the facing surface of the power transmission coil 16 facing the power receiving coil 26, and the lower surface of the power receiving coil 26 is the facing surface of the power receiving coil 26 facing the power transmission coil 16.

フェライトコア31は、送電コイル16の下面に配置されている。フェライトコア31は、例えば、送電コイル16の中心線から放射状に複数の磁性体の部材を配置することで構成される。磁気遮蔽板32は、地上の表面に沿って設けられ、ファライトコア31の下面に設けられ、送電ユニットの底面となる。磁気遮蔽板32は、送電コイル16と受電コイル26間の非接触球給電により漏れる磁束を遮蔽し、磁束を外部に漏洩させないようにする板状の部材である。磁気遮蔽板32は、例えばアルミ板により構成される。   The ferrite core 31 is disposed on the lower surface of the power transmission coil 16. The ferrite core 31 is configured by, for example, arranging a plurality of magnetic members radially from the center line of the power transmission coil 16. The magnetic shielding plate 32 is provided along the surface of the ground, is provided on the lower surface of the bright core 31, and serves as the bottom surface of the power transmission unit. The magnetic shielding plate 32 is a plate-like member that shields the magnetic flux that leaks due to non-contact sphere power feeding between the power transmission coil 16 and the power receiving coil 26 and prevents the magnetic flux from leaking to the outside. The magnetic shielding plate 32 is made of, for example, an aluminum plate.

保護部材33は、送電コイル16及びフェライトコア31を収容するための筐体であり、板状の天板部331と、側壁部332とにより形成されている。側壁部332は、磁気遮蔽板32の一端及び他端から、地面に対して鉛直方向に設けられ、天板部331は、送電コイル16のコイル面に沿って、送電コイル16の上側に設けられている。これにより、天板部331は受電コイル26と対向する送電コイル16の対向面に沿って配置されている。保護部材33は、ポリプロピレン、ポリアミド等の熱可塑性樹脂で形成されている。   The protection member 33 is a housing for housing the power transmission coil 16 and the ferrite core 31, and is formed by a plate-shaped top plate portion 331 and a side wall portion 332. The side wall portion 332 is provided in a direction perpendicular to the ground from one end and the other end of the magnetic shielding plate 32, and the top plate portion 331 is provided above the power transmission coil 16 along the coil surface of the power transmission coil 16. ing. Thereby, the top plate portion 331 is disposed along the facing surface of the power transmission coil 16 facing the power receiving coil 26. The protection member 33 is made of a thermoplastic resin such as polypropylene or polyamide.

また保護部材33の天板部331の内部には、流路171が形成されている。流路171は、天板部331の内部に管状の通路を設けることで形成されている。流路171は、図2に示すように、U字状に湾曲して形成されることで、送電コイル16の上面を往復する直線状の管を備えている。流路171内には、送電コイル16を冷却するために、冷媒として、水やLLC(ロングライフクーラント)等の液体が流れる。   A flow path 171 is formed inside the top plate portion 331 of the protection member 33. The channel 171 is formed by providing a tubular passage inside the top plate portion 331. As shown in FIG. 2, the flow path 171 includes a linear tube that reciprocates on the upper surface of the power transmission coil 16 by being curved in a U shape. In the flow path 171, in order to cool the power transmission coil 16, liquid, such as water and LLC (long life coolant), flows as a refrigerant.

本例の非接触給電装置において、送電コイル16と受電コイル26との間で、電力を給電すると、送電コイル16又は受電コイル26の発熱により、送電コイル16の温度が高くなる。特に、本例の非接触給電装置により車両200のバッテリ22を充電する場合には、送電コイル16による給電が長時間、行われることがあるため、送電コイル16の温度が高くなる。そのため、本例では、受電コイル26と対向する送電コイル16の対面側に流路171を設け、流路171に液体を流すことで、受電コイル26を冷却する。   In the non-contact power feeding device of this example, when power is fed between the power transmission coil 16 and the power receiving coil 26, the temperature of the power transmitting coil 16 increases due to heat generation of the power transmitting coil 16 or the power receiving coil 26. In particular, when the battery 22 of the vehicle 200 is charged by the non-contact power feeding device of this example, since the power feeding by the power transmission coil 16 may be performed for a long time, the temperature of the power transmission coil 16 becomes high. Therefore, in this example, the power receiving coil 26 is cooled by providing the flow path 171 on the opposite side of the power transmission coil 16 facing the power receiving coil 26 and flowing a liquid through the flow path 171.

図2及び図3に戻り、流路171の入口及び流路171の出口には、サーミスタ172及びサーミスタ173がそれぞれ設けられ、サーミスタ172は保護部材33内の流路171に入る流体の温度を検出し、サーミスタ173は保護部材33内の流路171から排出される流体の温度を検出する。流路171の入口には、流量計174が設けられ、流路171内の流量を計測する。また流路171の出口には、ポンプ175が設けられ、流路171を流れる流体の流速などを制御する。熱交換機176は、流路171の入口及び出口に接続され、流路171の出口から流れ込む流体の熱を奪い、流体の温度を下げて、流路171の入口に排出することで、流路171を循環させつつ流体の温度を下げる。熱交換器176は、例えばラジエータなどを備えている。なお、図2に示すように、本例では、サーミスタ172、サーミスタ173、流量計174、ポンプ175及び熱交換器176を、送電ユニット30外に設けたが、送電ユニット30内に設けてもよい。   2 and 3, a thermistor 172 and a thermistor 173 are provided at the inlet of the channel 171 and the outlet of the channel 171, respectively, and the thermistor 172 detects the temperature of the fluid entering the channel 171 in the protection member 33. The thermistor 173 detects the temperature of the fluid discharged from the flow path 171 in the protection member 33. A flow meter 174 is provided at the inlet of the flow channel 171 and measures the flow rate in the flow channel 171. A pump 175 is provided at the outlet of the channel 171 to control the flow rate of the fluid flowing through the channel 171. The heat exchanger 176 is connected to the inlet and outlet of the flow path 171, deprives the heat of the fluid flowing from the outlet of the flow path 171, lowers the temperature of the fluid, and discharges it to the inlet of the flow path 171. The temperature of the fluid is lowered while circulating. The heat exchanger 176 includes, for example, a radiator. As shown in FIG. 2, in this example, the thermistor 172, the thermistor 173, the flow meter 174, the pump 175, and the heat exchanger 176 are provided outside the power transmission unit 30, but may be provided inside the power transmission unit 30. .

次に、送電コイル16と受電コイル26との間の異物について、図4を用いて説明する。図4は、送電コイル16と受電コイル26との間に異物が存在する状態を説明するための図であり、図2のIII線に沿う断面図に相当する。図4に示すように、送電コイル16と受電コイル26との間であって、保護部材33の天板部331の上面に、金属片などの異物40が存在する。異物40が存在する状態で、本例の非接触給電装置を駆動させると、送電コイル16から受電コイル26に向けて磁束が発生する。当該磁束は異物40を通るため渦電流が異物40で発生し、異物40が発熱する。そして、非接触給電を継続させると、異物40の温度がさらに高くなり、異物40の熱が保護部材33を介して流路171内の流体に伝わる。そのため、流体の温度には、送電コイル16からの熱吸収による温度に加えて、異物40からの発熱による温度が加わる。一方、送電コイル16と受電コイル26との間に、異物40が存在しない場合には、流体の温度は、送電コイル16からの発熱により上昇し、異物40からの発熱による温度上昇はなくなる。   Next, foreign matter between the power transmission coil 16 and the power reception coil 26 will be described with reference to FIG. FIG. 4 is a diagram for explaining a state in which foreign matter exists between the power transmission coil 16 and the power reception coil 26, and corresponds to a cross-sectional view taken along line III in FIG. As shown in FIG. 4, a foreign object 40 such as a metal piece exists between the power transmission coil 16 and the power reception coil 26 and on the top surface of the top plate portion 331 of the protection member 33. When the contactless power supply device of this example is driven in the state where the foreign object 40 is present, a magnetic flux is generated from the power transmission coil 16 toward the power reception coil 26. Since the magnetic flux passes through the foreign matter 40, an eddy current is generated in the foreign matter 40, and the foreign matter 40 generates heat. When the non-contact power feeding is continued, the temperature of the foreign matter 40 is further increased, and the heat of the foreign matter 40 is transmitted to the fluid in the flow path 171 through the protection member 33. Therefore, in addition to the temperature due to heat absorption from the power transmission coil 16, the temperature due to heat generation from the foreign material 40 is added to the temperature of the fluid. On the other hand, when the foreign object 40 does not exist between the power transmission coil 16 and the power reception coil 26, the temperature of the fluid rises due to the heat generated from the power transmission coil 16, and the temperature rise due to the heat generated from the foreign object 40 is eliminated.

次に、異物検出部151による、サーミスタ172及びサーミスタ173の検出温度から異物を検出方法について説明する。流路171内の流体を冷却水とし、冷却水の比熱をCp、流路171内に流れる流体の流量をGwとする。流量(G)は、流量計174から計測される。 Next, a method for detecting foreign matter from the detection temperatures of the thermistor 172 and the thermistor 173 by the foreign matter detection unit 151 will be described. Let the fluid in the channel 171 be cooling water, the specific heat of the cooling water be Cp, and the flow rate of the fluid flowing in the channel 171 be Gw. The flow rate (G w ) is measured from the flow meter 174.

送電コイル16と受電コイル26との間で非接触で電力が給電され、送電コイル16が発熱すると、サーミスタ173の検出温度がサーミスタ172の検出温度より高くなる。この時、冷却水の熱量(Q)は、サーミスタ172の検出温度(T)と、サーミスタ173の検出温度(T)と、冷却水の比熱(C)と、流量計174の計測流量(G)とを用いて、下記の式(1)により演算される。 When power is supplied in a non-contact manner between the power transmission coil 16 and the power reception coil 26 and the power transmission coil 16 generates heat, the temperature detected by the thermistor 173 becomes higher than the temperature detected by the thermistor 172. At this time, the heat quantity (Q) of the cooling water is determined based on the detected temperature (T i ) of the thermistor 172, the detected temperature (T o ) of the thermistor 173, the specific heat (C p ) of the cooling water, and the measured flow rate of the flow meter 174. Using (G w ), the following equation (1) is used.

Figure 2012228122
そして、異物が存在しない場合には、冷却水へ加われる熱は、主に送電コイル16からの発熱によるものであるため、冷却水の熱量(Q)が、送電コイル16による発熱量(Q)となる。
Figure 2012228122
When no foreign matter is present, the heat applied to the cooling water is mainly due to the heat generated from the power transmission coil 16, so the heat quantity (Q) of the cooling water is the heat value (Q i ) generated by the power transmission coil 16. )

一方、送電コイル16と受電コイル26との間に異物が存在する場合に、非接触で電力が供給されると、冷却水の熱量には、異物の発熱量(QWe)が加わる。異物の発熱量(QWe)は、異物に流れる渦電流の電流損に相当する。ここで、異物を長さ(L)、幅(W)及び厚さ(D)の金属板とし、異物の導電率をσ、異物における表皮深さをδ、異物の透磁率をμ、非接触給電により発生する磁束密度をBとすると、渦電流損(W)は、下記の式(2)により求められる。 On the other hand, when there is a foreign object between the power transmission coil 16 and the power receiving coil 26, if power is supplied in a non-contact manner, the heat generation amount (Q We ) of the foreign object is added to the heat quantity of the cooling water. The amount of heat generated by the foreign matter (Q We ) corresponds to the current loss of the eddy current flowing through the foreign matter. Here, the foreign material is a metal plate of length (L), width (W) and thickness (D), the electrical conductivity of the foreign material is σ, the skin depth of the foreign material is δ, the magnetic permeability of the foreign material is μ, and non-contact Assuming that the magnetic flux density generated by power feeding is B, the eddy current loss (W e ) is obtained by the following equation (2).

Figure 2012228122
そして、異物が存在する場合は、冷却水の熱量(Q)は、式(3)で示されるように、コイルの発熱量(Q)に、式2で算出される渦電流損と等価な異物の発熱量(QWe)を加えた熱量となる。
Figure 2012228122
When foreign matter is present, the amount of heat (Q) of the cooling water is equivalent to the amount of heat generated by the coil (Q i ), which is equivalent to the eddy current loss calculated by Equation 2, as shown by Equation (3). The amount of heat is the sum of the heat generation amount (Q We ) of the foreign matter.

Figure 2012228122
すなわち、異物が存在しない場合には、冷却水の熱量は、送電コイル16の発熱量となり、異物が存在する場合には、冷却水の熱量は、送電コイル16の発熱量より高くなる。
Figure 2012228122
That is, when there is no foreign matter, the amount of heat of the cooling water is the amount of heat generated by the power transmission coil 16, and when there is a foreign matter, the amount of heat of the cooling water is higher than the amount of heat generated by the power transmission coil 16.

比熱は予め決まり、流量もポンプ175の出力を設定することで決定されるため、サーミスタ172及びサーミスタ173の検出温度から、冷却水の熱量が決まる。そして、送電コイル16からの発熱量は、コイルに使用される導電の長さ及び抵抗と、送電電力の電力量から算出され、当該導電の長さ及び抵抗は予め決まるため、送電コイル16からの発熱量は、給電制御部15により設定される送電電力の電力量によって決まる。   Since the specific heat is determined in advance and the flow rate is also determined by setting the output of the pump 175, the heat quantity of the cooling water is determined from the detected temperatures of the thermistor 172 and the thermistor 173. The amount of heat generated from the power transmission coil 16 is calculated from the length and resistance of the conductive used in the coil and the amount of power of the transmitted power. Since the length and resistance of the conductive are determined in advance, The amount of generated heat is determined by the amount of transmitted power set by the power supply control unit 15.

異物検出部151は、電力量に基づくコイルの発熱量に、異物の発熱量に相当する熱量を加えた熱量を、閾値熱量(Q)として、設定する。また異物検出部151は、サーミスタ172及びサーミスタ173の検出温度と、流量計174の計測流量とから冷却水の熱量(Q)を算出し、当該熱量(Q)と、閾値熱量(Q)とを比較する。そして、異物検出部151は、冷却水の熱量(Q)が閾値熱量(Q)より低い場合には、異物が存在しないと判定し、冷却水の熱量(Q)が閾値熱量(Q)以上である場合には、異物が存在すると判定する。 The foreign object detection unit 151 sets, as a threshold heat quantity (Q c ), a heat quantity obtained by adding a heat quantity corresponding to the heat generation quantity of the foreign substance to the heat generation quantity of the coil based on the electric energy. The foreign matter detection unit 151 calculates the heat quantity (Q) of the cooling water from the detected temperature of the thermistor 172 and the thermistor 173 and the flow rate measured by the flow meter 174, and the heat quantity (Q) and the threshold heat quantity (Q c ). Compare When the heat quantity (Q) of the cooling water is lower than the threshold heat quantity (Q c ), the foreign object detection unit 151 determines that there is no foreign object, and the heat quantity (Q) of the cooling water is the threshold heat quantity (Q c ). If it is above, it is determined that there is a foreign object.

これにより、異物検出部151は、サーミスタ172及びサーミスタ173の検出温度に基づいて、送電コイル16と受電コイル26との間の異物を検出する。   As a result, the foreign matter detection unit 151 detects foreign matter between the power transmission coil 16 and the power reception coil 26 based on the detected temperatures of the thermistor 172 and the thermistor 173.

次に、給電制御部15の制御について説明する。車両が所定の駐車スペースに駐車され、コントローラ28から、バッテリ22を充電する旨の制御信号が通信部13により受信されると、給電制御部15は、送電回路部12を制御し、送電コイル16から送電される電力を設定する。給電制御部15は、給電を開始すると、冷却装置17に含まれるポンプ175を制御して、冷却水を流路171に流す。また給電制御部15に含まれる異物検出部151は、給電中、所定の周期で、サーミスタ172及びサーミスタ173により流路171の入口及び出口を流れる冷却水の温度をそれぞれ検出し、上記の異物検出方法で、異物の有無を検出する。給電制御部15は、異物検出部151により異物が存在しないと判断した場合には、送電電力を下げることなく、給電を継続する。   Next, control of the power supply control unit 15 will be described. When the vehicle is parked in a predetermined parking space and a control signal indicating that the battery 22 is charged is received from the controller 28 by the communication unit 13, the power supply control unit 15 controls the power transmission circuit unit 12, and the power transmission coil 16. Set the power transmitted from the. When the power supply control unit 15 starts power supply, the power supply control unit 15 controls the pump 175 included in the cooling device 17 to flow the cooling water through the flow path 171. In addition, the foreign matter detection unit 151 included in the power supply control unit 15 detects the temperature of the cooling water flowing through the inlet and outlet of the flow path 171 by the thermistor 172 and the thermistor 173 at predetermined intervals during power supply, and detects the foreign matter described above. The method detects the presence or absence of foreign matter. When the power supply control unit 15 determines that no foreign object is present by the foreign object detection unit 151, the power supply control unit 15 continues power supply without reducing the transmission power.

一方、給電制御部15は、異物検出部151により異物が存在すると判断した場合には、送電電力を下げて、給電を行う。異物が存在する状態で、送電電力を維持したまま、継続して給電させると、異物の温度が高くなり、熱可塑性樹脂である保護部材33が溶けて破損するおそれがある。また、異物の存在を検出した場合に、送電電力をゼロにした場合には、送電コイル16と受電コイル26との間に異物があると、給電を継続することができなくなってしまう。そのため、本例は、異物の存在を検出した場合には、送電電力を下げた上で給電を継続させることで、異物の過度な温度上昇を防ぎつつ、給電を継続させる。   On the other hand, when the power supply control unit 15 determines that the foreign object is present by the foreign object detection unit 151, the power supply control unit 15 performs power supply by reducing the transmission power. If power is continuously supplied while the transmitted power is maintained in the presence of foreign matter, the temperature of the foreign matter increases and the protective member 33, which is a thermoplastic resin, may melt and break. In addition, when the presence of a foreign object is detected and the transmitted power is set to zero, if there is a foreign object between the power transmission coil 16 and the power receiving coil 26, power supply cannot be continued. Therefore, in this example, when the presence of a foreign object is detected, the power supply is continued after lowering the transmission power, thereby continuing the power supply while preventing an excessive temperature rise of the foreign object.

次に、図5を用いて、本例の非接触給電装置の制御手順を説明する。図5は、本例の非接触給電装置の制御手順を示すフローチャートである。   Next, the control procedure of the non-contact power feeding device of this example will be described with reference to FIG. FIG. 5 is a flowchart showing a control procedure of the non-contact power feeding apparatus of this example.

ステップS1にて、コントローラ28は、本例の非接触給電装置によりバッテリ22を充電するために、給電開始する旨の制御信号を送信し、給電制御部15は、当該制御信号に基づいて、給電を開始する。ステップS2にて、給電制御部15は、送電回路部12を制御し、送電コイル16から受電コイル26へ電力を送電する。ステップS3にて、給電制御部15は、送電電力及び給電開始からの送電時間から、送電電力の電力量を算出する。   In step S1, the controller 28 transmits a control signal for starting power supply in order to charge the battery 22 by the non-contact power supply device of this example, and the power supply control unit 15 supplies power based on the control signal. To start. In step S <b> 2, the power supply control unit 15 controls the power transmission circuit unit 12 to transmit power from the power transmission coil 16 to the power reception coil 26. In step S3, the power supply control unit 15 calculates the amount of transmitted power from the transmitted power and the power transmission time from the start of power supply.

ステップS4にて、給電制御部15は、ステップS3で算出された電力量から送電コイル16からの発熱量(Q)を算出し、当該発熱量(Q)に、異物の発熱量(QWe)に相当する熱量を加え、閾値熱量(Q)を算出する。ステップS5にて、給電制御部15は、サーミスタ172及びサーミスタ173の検出温度から、流路171内を通る流体(冷却水)の熱量(Q)を算出する。ステップS6にて、異物検出部151は、当該熱量(Q)と閾値熱量(Q)とを比較する。熱量(Q)が閾値熱量(Q)未満である場合には、異物検出部151は、送電コイル16と受電コイル26との間に異物が存在しない、と判定する(ステップS7)。異物が存在しない場合には、給電制御部15は、送電電力を維持し、給電を継続させ、ステップS8に遷移する。ステップS8にて、給電制御部13は、コントローラ28からの制御信号から、バッテリ22の充電が終了したか否かを判断する。バッテリ22の充電が終了していない場合には、ステップS3に戻り、バッテリ22の充電が終了した場合には、本例の制御処理を終了する。 In step S4, the power supply control unit 15 calculates a heat generation amount (Q i ) from the power transmission coil 16 from the power amount calculated in step S3, and the heat generation amount (Q i ) of the foreign object is calculated as the heat generation amount (Q i ). The amount of heat corresponding to We ) is added, and the threshold amount of heat ( Qc ) is calculated. In step S <b> 5, the power supply control unit 15 calculates the amount of heat (Q) of the fluid (cooling water) passing through the flow path 171 from the detected temperatures of the thermistor 172 and the thermistor 173. In step S6, the foreign matter detection unit 151 compares the heat quantity (Q) with the threshold heat quantity (Q c ). When the amount of heat (Q) is less than the threshold amount of heat (Q c ), the foreign object detector 151 determines that there is no foreign object between the power transmission coil 16 and the power reception coil 26 (step S7). When there is no foreign object, the power supply control unit 15 maintains the transmission power, continues the power supply, and proceeds to step S8. In step S <b> 8, the power supply control unit 13 determines from the control signal from the controller 28 whether or not the charging of the battery 22 has been completed. If the charging of the battery 22 has not ended, the process returns to step S3, and if the charging of the battery 22 has ended, the control process of this example is ended.

ステップS6に戻り、熱量(Q)が閾値熱量(Q)以上である場合には、異物検出部151は、送電コイル16と受電コイル26との間に異物が存在する、と判定する(ステップS9)。ステップS10にて、給電制御部15は、送電回路部12を制御し、送電電力を下げて、給電を行い、ステップS8に遷移する。 Returning to step S6, if the heat quantity (Q) is equal to or greater than the threshold heat quantity (Q c ), the foreign object detector 151 determines that there is a foreign object between the power transmission coil 16 and the power receiving coil 26 (step). S9). In step S10, the power supply control unit 15 controls the power transmission circuit unit 12, lowers the transmitted power, performs power supply, and transitions to step S8.

上記のように、本例は、受電コイル26と対向する送電コイル16の対向面側に流路171を設けて、異物検出手段151により、流路内171を通る冷媒の検出温度に基づいて、送電コイル16と受電コイル26との間の異物を検出する。これにより、送電コイル16と受電コイル26との間の異物の存在により、給電効率が下がった場合に、給電効率の原因である異物の存在を特定することができる。また、本例は、送電コイル16と受電コイル26との間の異物の存在を検出することができるため、当該異物を送電コイル16と受電コイル26との間から排除させることで、給電効率の低下を防ぐことができる。   As described above, in this example, the flow path 171 is provided on the facing surface side of the power transmission coil 16 facing the power receiving coil 26, and the foreign matter detection unit 151 determines the temperature of the refrigerant passing through the flow path 171 based on the detected temperature of the refrigerant. Foreign matter between the power transmission coil 16 and the power reception coil 26 is detected. Thereby, when the power supply efficiency is lowered due to the presence of the foreign matter between the power transmission coil 16 and the power receiving coil 26, the presence of the foreign matter that is the cause of the power supply efficiency can be specified. In addition, in this example, since the presence of a foreign object between the power transmission coil 16 and the power receiving coil 26 can be detected, by removing the foreign object from between the power transmitting coil 16 and the power receiving coil 26, the power supply efficiency can be improved. Decline can be prevented.

また本例は、異物の存在を検出することで、給電効率の低下が、異物の存在によるものか、あるいは、コイルの位置ずれ等の他の原因によるものかを区別することができるため、実際には異物が存在しているにもかかわらず、コイルの位置ずれを是正するように再駐車を行う等、運転手にとって余分な措置をとることを避けることができる。   In addition, in this example, by detecting the presence of foreign matter, it is possible to distinguish whether the decrease in power supply efficiency is due to the presence of foreign matter or other causes such as coil misalignment. In spite of the presence of foreign matter, it is possible to avoid taking extra measures for the driver, such as re-parking so as to correct the displacement of the coil.

また本例は、天板部331を有した保護部材31で送電コイル16を保護し、天板部331の内部に流路171を設け、異物検出手段151により、天板部331の表面に存在する異物を検出する。これにより、本例は、天板部331の表面に異物が存在することで、給電効率が下がった場合に、給電効率の原因である異物の存在を特定することができる。また、本例は、天板部331の表面に異物が存在することを検出するため、当該異物を天板部331から排除させることで、給電効率の低下を防ぐことができる。   Further, in this example, the power transmission coil 16 is protected by the protection member 31 having the top plate portion 331, the flow path 171 is provided inside the top plate portion 331, and the foreign object detection means 151 is present on the surface of the top plate portion 331. Detecting foreign objects to be detected. Thereby, this example can specify presence of the foreign material which is the cause of electric power feeding efficiency, when foreign material exists in the surface of the top-plate part 331 and electric power feeding efficiency falls. Moreover, since this example detects the presence of a foreign object on the surface of the top plate portion 331, it is possible to prevent a reduction in power supply efficiency by removing the foreign material from the top plate portion 331.

また異物が天板部331の表面に存在し、非接触給電により異物が発熱する場合に、流路171内を流れる流体により異物を冷却させることができる。また、送電コイル16の発熱、あるいは、外部からの障害物等によって、保護部材31が破損し、流路171内の液体が漏れ出た場合に、保護部材31の破損を検知することができる。また異物が、天板部331の表面に存在し、当該異物の発熱により保護部材31の内部の流路171が破損した場合には、流路171から漏れ出た液体により異物を急速に冷却させることができ、異物からの発熱による、送電コイル16または他の電子部品への影響を防ぐことができる。   In addition, when foreign matter exists on the surface of the top plate portion 331 and the foreign matter generates heat by non-contact power feeding, the foreign matter can be cooled by the fluid flowing in the flow path 171. Further, when the protective member 31 is damaged due to heat generation of the power transmission coil 16 or an obstacle from the outside, and the liquid in the flow path 171 leaks, the breakage of the protective member 31 can be detected. Further, when foreign matter exists on the surface of the top plate portion 331 and the flow path 171 inside the protective member 31 is damaged due to heat generation of the foreign matter, the foreign matter is rapidly cooled by the liquid leaking from the flow path 171. It is possible to prevent the heat generation from the foreign matter from affecting the power transmission coil 16 or other electronic components.

また本例は、異物が存在する場合の流体の温度と、異物が存在しない場合の流体の温度とを比較することで、異物を検出する。これにより、本例は、異物が存在する場合の流体の温度変化を検出することができるため、送電コイル16と受電コイル26との間の異物の存在により、給電効率が下がった場合に、給電効率の原因である異物の存在を特定することができる。   Further, in this example, the foreign matter is detected by comparing the temperature of the fluid when the foreign matter is present with the temperature of the fluid when the foreign matter is not present. As a result, in this example, the temperature change of the fluid in the presence of foreign matter can be detected. Therefore, when the power feeding efficiency decreases due to the presence of foreign matter between the power transmission coil 16 and the power receiving coil 26, power feeding is performed. It is possible to identify the presence of foreign matter that is the cause of efficiency.

さらに本例は、コイルを冷却させる冷媒の温度を管理するサーミスタ172、173を、異物検知に利用しているため、異物検知のための専用のセンサを別途設ける必要がなく、非接触充電装置の構造の複雑化を防ぐことができる。   Furthermore, in this example, since the thermistors 172 and 173 that manage the temperature of the refrigerant that cools the coil are used for foreign object detection, there is no need to separately provide a dedicated sensor for foreign object detection. The complexity of the structure can be prevented.

なお本例は、異物検出部151により検出される異物は、金属板に限らず他の導体又は半導体を含む部材であればよい。   In this example, the foreign matter detected by the foreign matter detection unit 151 is not limited to a metal plate, but may be a member including another conductor or semiconductor.

また本例は、異物を検出し、送電電力を下げる場合には、送電電力を段階的に下げてもよく、閾値熱量(Q)と熱量(Q)との差が大きいほど、送電電力を小さくするように制御してもよい。 Further, in this example, when detecting a foreign object and lowering the transmission power, the transmission power may be reduced stepwise. The larger the difference between the threshold heat quantity (Q c ) and the heat quantity (Q), the lower the transmission power. You may control to make it small.

また本例は、流体の熱量を算出し、算出した熱量に基づいて異物を検出するが、熱量を算出することなく、サーミスタ172及びサーミスタ173の温度から異物を検出すればよい。すなわち、送電コイル16の抵抗等は予め決まっているため、給電による電力量が把握できれば、異物が存在しない時の、給電による流体の上昇温度を、予め算出することができる。そのため、給電制御部15は、サーミスタ173の検出温度と、給電による、流体の上昇温度と比較し、検出温度が当該上昇温度を超えて高温になっている場合には、異物が存在していると判定すればよい。   In this example, the amount of heat of the fluid is calculated and foreign matter is detected based on the calculated amount of heat. However, the foreign matter may be detected from the temperatures of the thermistor 172 and the thermistor 173 without calculating the amount of heat. That is, since the resistance and the like of the power transmission coil 16 are determined in advance, if the amount of power by power supply can be grasped, the rising temperature of the fluid by power supply when there is no foreign object can be calculated in advance. Therefore, the power supply control unit 15 compares the detected temperature of the thermistor 173 with the rising temperature of the fluid due to power supply. If the detected temperature is higher than the increased temperature, foreign matter is present. Can be determined.

また本例において、給電制御部15は、図5に示す制御フローの最中に、冷却水が切れた場合には、非常停止するように、送電回路部12を制御し、給電を止める。すなわち、送電コイル16と受電コイル26との間の異物が発熱し、異物が高温になり、熱可塑性樹脂の保護部材33に含まれる流路171が破損した場合には、冷却水が流路171外に漏れ出てしまう。そのため、給電制御部15は、流量計174等の検出値に基づいて、冷却水切れを検出した場合には、非常停止させる。これにより、本例は、フェルセーフ制御を実現し、安全性を高めることができる。   Further, in this example, the power supply control unit 15 stops the power supply by controlling the power transmission circuit unit 12 to perform an emergency stop when the cooling water is cut off during the control flow shown in FIG. That is, when the foreign matter between the power transmission coil 16 and the power receiving coil 26 generates heat, the foreign matter becomes high temperature, and the flow path 171 included in the protection member 33 made of thermoplastic resin is damaged, the cooling water flows into the flow path 171. Leak out. For this reason, the power supply control unit 15 performs an emergency stop when detecting the lack of cooling water based on the detection value of the flow meter 174 or the like. Thereby, this example can implement | achieve fel safe control and can improve safety | security.

また本例において、流路171内を流れる流体は、必ずしも送電コイル16の冷却する必要なく、例えば給電制御部15に含まれる回路部品を冷却してもよい。   In this example, the fluid flowing in the flow path 171 does not necessarily cool the power transmission coil 16, and may cool circuit components included in the power supply control unit 15, for example.

上記受電コイル26は本発明に係る第1のコイルに相当し、送電コイル16は本発明に係る第2のコイルに、サーミスタ172、173は本発明に係る温度検出手段に、異物検出部151は本発明に係る異物検出手段に相当する。   The power receiving coil 26 corresponds to the first coil according to the present invention, the power transmitting coil 16 is the second coil according to the present invention, the thermistors 172 and 173 are the temperature detecting means according to the present invention, and the foreign matter detector 151 is This corresponds to the foreign matter detection means according to the present invention.

《第2実施形態》
図6は、発明の他の実施形態に係る非接触給電装置の送電コイル16及び冷却装置17の平面図である。本例では上述した第1実施形態に対して、冷却装置17の一部の構成及び制御が異なる。これ以外の構成は上述した第1実施形態と同じであるため、その記載を援用する。なお図6の矢印は、後述する流路171を流れる冷媒の流れる向きである。
<< Second Embodiment >>
FIG. 6 is a plan view of a power transmission coil 16 and a cooling device 17 of a non-contact power feeding device according to another embodiment of the invention. In this example, the configuration and control of a part of the cooling device 17 are different from those of the first embodiment described above. Since the other configuration is the same as that of the first embodiment described above, the description thereof is incorporated. In addition, the arrow of FIG. 6 is the direction through which the refrigerant | coolant which flows through the flow path 171 mentioned later flows.

図6に示すように、冷却装置17は、流路171と、サーミスタ172と、サーミスタ173と、ブロア177と、圧力計178と、熱交換器176とを備えている。サーミスタ172及びサーミスタ173は、上述した第1実施形態と同様であるため、説明を省略する。   As shown in FIG. 6, the cooling device 17 includes a flow path 171, a thermistor 172, a thermistor 173, a blower 177, a pressure gauge 178, and a heat exchanger 176. The thermistor 172 and the thermistor 173 are the same as those in the first embodiment described above, and a description thereof will be omitted.

流路171の形状は、上述した第1実施形態と同様であるが、本例では、流路171の冷媒として気体を流し、流路171は気体を運ぶダクトとなる。ブロア177は、流路171の入口に設けられ、ファンを回転させて、冷媒を送風する。圧力計178は流路171の出口に設けられ、流路171内の冷媒の圧力を計測する。熱交換器176は、空冷式の熱交換器176である。   The shape of the flow path 171 is the same as that of the first embodiment described above, but in this example, a gas flows as the refrigerant of the flow path 171, and the flow path 171 becomes a duct for carrying the gas. The blower 177 is provided at the inlet of the flow path 171 and rotates the fan to blow the refrigerant. The pressure gauge 178 is provided at the outlet of the channel 171 and measures the pressure of the refrigerant in the channel 171. The heat exchanger 176 is an air-cooled heat exchanger 176.

異物検出部151は、第1実施形態と同様に、流路171内の冷媒の熱量(Q)と閾値熱量(Q)とを比較することで、異物を検出するが、熱量(Q)を算出する際に、圧力計178の計測圧力と、ブロア177の回転数から流量(G)を算出し、算出した流量(G)と、サーミスタ172及びサーミスタ173の検出温度とに基づいて、上述した式(1)を用いて、熱量(Q)を算出する。 As in the first embodiment, the foreign matter detection unit 151 detects the foreign matter by comparing the heat quantity (Q) of the refrigerant in the flow path 171 with the threshold heat quantity (Q c ). When calculating, the flow rate (G w ) is calculated from the pressure measured by the pressure gauge 178 and the rotation speed of the blower 177, and based on the calculated flow rate (G w ) and the detected temperatures of the thermistor 172 and the thermistor 173, The amount of heat (Q) is calculated using the above-described equation (1).

これにより、本例は、送電コイル16を冷却する冷却媒体を、液体だけではなく、気体を用い、さらに当該気体の温度に基づいて、送電コイル16と受電コイル26との間の異物を検出する。   Thus, in this example, not only liquid but also gas is used as a cooling medium for cooling the power transmission coil 16, and foreign matter between the power transmission coil 16 and the power reception coil 26 is detected based on the temperature of the gas. .

上記のように、本例は、受電コイル26と対向する送電コイル16の対向面側に流路171を設けて、異物検出手段151により、流路内171を通る冷媒の検出温度に基づいて、送電コイル16と受電コイル26との間の異物を検出する。これにより、送電コイル16と受電コイル26との間の異物の存在により、給電効率が下がった場合に、給電効率の原因である異物の存在を特定することができる。また、本例は、送電コイル16と受電コイル26との間の異物の存在を検出することができるため、当該異物を送電コイル16と受電コイル26との間から排除させることで、給電効率の低下を防ぐことができる。   As described above, in this example, the flow path 171 is provided on the facing surface side of the power transmission coil 16 facing the power receiving coil 26, and the foreign matter detection unit 151 determines the temperature of the refrigerant passing through the flow path 171 based on the detected temperature of the refrigerant. Foreign matter between the power transmission coil 16 and the power reception coil 26 is detected. Thereby, when the power supply efficiency is lowered due to the presence of the foreign matter between the power transmission coil 16 and the power receiving coil 26, the presence of the foreign matter that is the cause of the power supply efficiency can be specified. In addition, in this example, since the presence of a foreign object between the power transmission coil 16 and the power receiving coil 26 can be detected, by removing the foreign object from between the power transmitting coil 16 and the power receiving coil 26, the power supply efficiency can be improved. Decline can be prevented.

なお、本例において、給電制御部15は、図5に示す制御フローの最中に、冷媒漏れを検出した場合には、非常停止するように、送電回路部12を制御し、給電を止める。すなわち、送電コイル16と受電コイル26との間の異物が発熱し、異物が高温になり、熱可塑性樹脂の保護部材33に含まれる流路171が破損した場合には、流路171内の気体が外に漏れ出てしまう。そのため、給電制御部15は、ブロア177の回転数及びサーミスタ172又はサーミスタ173の検出温度と、流路171内の気体の圧力との関係を予めマップとして格納し、圧力計178の計測圧力が、当該マップ上から外れ、低くなった場合に、給電を止める。これにより、本例は、フェルセーフ制御を実現し、安全性を高めることができる。   In this example, when the refrigerant supply is detected during the control flow shown in FIG. 5, the power supply control unit 15 controls the power transmission circuit unit 12 to stop the power supply so that the emergency stop is performed. That is, when the foreign matter between the power transmission coil 16 and the power receiving coil 26 generates heat, the foreign matter becomes high temperature, and the flow path 171 included in the protection member 33 made of thermoplastic resin is damaged, the gas in the flow path 171 Leaks out. Therefore, the power supply control unit 15 stores in advance a relationship between the rotational speed of the blower 177 and the detected temperature of the thermistor 172 or thermistor 173 and the pressure of the gas in the flow path 171 as a map, and the measured pressure of the pressure gauge 178 is When it falls off the map and becomes low, power supply is stopped. Thereby, this example can implement | achieve fel safe control and can improve safety | security.

《第3実施形態》
図7は、発明の他の実施形態に係る非接触給電装置の制御手順を示すフローチャートである。本例では上述した第1実施形態に対して、給電制御部15の制御の一部が異なる。これ以外の構成は上述した第1実施形態と同じであるため、第1実施形態及び第2実施形態の記載を援用する。
<< Third Embodiment >>
FIG. 7 is a flowchart showing a control procedure of the non-contact power feeding apparatus according to another embodiment of the invention. In this example, part of the control of the power supply control unit 15 is different from the first embodiment described above. Since the configuration other than this is the same as that of the first embodiment described above, the description of the first embodiment and the second embodiment is incorporated.

本例において、給電制御部15は、異物検出部151により異物の存在を検出し、送電電力を下げて、サーミスタ173の検出温度に応じて、低下した送電電力で給電を継続するか、給電を停止するかを判定する。上述の通り、送電コイル16と受電コイル26との間の異物は、非接触給電による磁束によって発熱する。そして、送電電力を下げることで、異物の温度上昇は緩やかになるが、異物の温度は上昇し続けるおそれがある。そのため、給電制御部15は、異物が高温になることで保護部材33が破損する前に、給電を停止させる。   In this example, the power supply control unit 15 detects the presence of the foreign material by the foreign material detection unit 151, reduces the transmission power, and continues the power supply with the reduced transmission power according to the detected temperature of the thermistor 173, or supplies the power. Determine whether to stop. As described above, the foreign matter between the power transmission coil 16 and the power reception coil 26 generates heat due to the magnetic flux generated by non-contact power feeding. And by lowering the transmission power, the temperature rise of the foreign matter becomes moderate, but the temperature of the foreign matter may continue to rise. Therefore, the power supply control unit 15 stops power supply before the protection member 33 is damaged due to the high temperature of the foreign matter.

具体的には、給電制御部15は、サーミスタ173の検出温度(T)と、流体の許容温度(Tlim)とを比較し、当該検出温度(T)が許容温度(Tlim)以上になった場合に、送電回路部12を制御し、送電を停止させる。許容温度(Tlim)は予め設定される温度であり、保護部材33の耐熱温度に達した時の流体の温度に相当する。 Specifically, the power supply control unit 15 compares the detected temperature (T o ) of the thermistor 173 with the allowable temperature (T lim ) of the fluid, and the detected temperature (T o ) is equal to or higher than the allowable temperature (T lim ). In such a case, the power transmission circuit unit 12 is controlled to stop power transmission. The allowable temperature (T lim ) is a preset temperature and corresponds to the temperature of the fluid when the heat resistance temperature of the protection member 33 is reached.

次に、図7を用いて、本例の非接触給電の制御手順を説明する。なお、ステップS1〜ステップS10までの制御内容は、図5に示すステップS1〜ステップS10までの制御内容と、それぞれ同様であるため説明を省略する。   Next, the control procedure of contactless power feeding of this example will be described with reference to FIG. The control contents from step S1 to step S10 are the same as the control contents from step S1 to step S10 shown in FIG.

ステップS10により送電電力を下げた後に、ステップS11にて、給電制御部15は、サーミスタ173の検出温度(T)と、流体の許容温度(Tlim)とを比較する。サーミスタ173の検出温度(T)が許容温度(Tlim)より低い場合には、ステップS10の送電電力で給電を継続させても、保護部材33の破損の可能性は低いと判断して、送電コイル16から受電コイル26への給電を継続し、ステップS8に遷移する。一方、サーミスタ173の検出温度(T)が許容温度(Tlim)以上である場合には、ステップS10の送電電力でこれ以上、給電を継続させると、保護部材33が破損するおそれがあると判断し、給電制御部15は送電電力をゼロにし、非常停止し、送電コイル16から受電コイル26への給電を中止する。 After lowering the transmitted power in step S10, in step S11, the power supply control unit 15 compares the detected temperature (T o ) of the thermistor 173 with the allowable temperature (T lim ) of the fluid. If the detected temperature (T o ) of the thermistor 173 is lower than the allowable temperature (T lim ), it is determined that the possibility of damage to the protection member 33 is low even if power feeding is continued with the transmitted power in step S10. The power supply from the power transmission coil 16 to the power reception coil 26 is continued, and the process proceeds to step S8. On the other hand, if the detected temperature (T o ) of the thermistor 173 is equal to or higher than the allowable temperature (T lim ), the protective member 33 may be damaged if the power is continuously supplied with the transmitted power in step S10. The power supply control unit 15 determines the power transmission power to zero, performs an emergency stop, and stops power supply from the power transmission coil 16 to the power reception coil 26.

100…充電装置
11…交流電源
12…送電回路部
13…通信部
14…位置検出部
15…給電制御部
151…異物検出部
16…送電コイル
17…冷却装置
171…流路
172、173…サーミスタ
174…流量計
175…ポンプ
176…熱交換器
177…ブロア
178…圧力計
200…車両
21…受電回路部
22…バッテリ
23…通信部
24…インバータ(INV)
25…充電制御部
26…受電コイル
27…モータ
28…コントローラ
30…給電ユニット
31…フェライトコア
32…磁気遮蔽板
33…保護部材
331…天板部
332…側壁部
40…異物
DESCRIPTION OF SYMBOLS 100 ... Charging apparatus 11 ... AC power supply 12 ... Power transmission circuit part 13 ... Communication part 14 ... Position detection part 15 ... Power supply control part 151 ... Foreign substance detection part 16 ... Power transmission coil 17 ... Cooling device 171 ... Channel 172,173 ... Thermistor 174 ... Flow meter 175 ... Pump 176 ... Heat exchanger 177 ... Blower 178 ... Pressure gauge 200 ... Vehicle 21 ... Power receiving circuit unit 22 ... Battery 23 ... Communication unit 24 ... Inverter (INV)
DESCRIPTION OF SYMBOLS 25 ... Charge control part 26 ... Power receiving coil 27 ... Motor 28 ... Controller 30 ... Power feeding unit 31 ... Ferrite core 32 ... Magnetic shielding board 33 ... Protection member 331 ... Top plate part 332 ... Side wall part 40 ... Foreign material

Claims (3)

少なくとも磁気的結合によって第1のコイルとの間で、非接触で電力を送電又は受電する第2のコイルと、
前記第1のコイルと対向する前記第2のコイルの対面側に設けられた流路と、
前記流路内を通る冷媒の温度を検出する温度検出手段と、
前記温度検出手段により検出された検出温度に基づいて、前記第1のコイルと前記第2のコイルとの間の異物を検出する異物検出手段とを備える
ことを特徴とする非接触給電装置。
A second coil that transmits or receives power in a contactless manner with respect to the first coil at least by magnetic coupling;
A flow path provided on the opposite side of the second coil facing the first coil;
Temperature detecting means for detecting the temperature of the refrigerant passing through the flow path;
A non-contact power feeding apparatus comprising: a foreign matter detecting means for detecting a foreign matter between the first coil and the second coil based on the detected temperature detected by the temperature detecting means.
前記第2のコイルを保護する保護部材をさらに備え、
前記保護部材は、前記第2のコイルの対向面に沿う板状の板部材を有し、
前記流路は、前記板部材の内部に設けられ、
前記異物検出手段は、前記板部材の表面に存在する前記異物を検出する
ことを特徴とする請求項1記載の非接触給電装置。
A protective member for protecting the second coil;
The protective member has a plate-like plate member along the facing surface of the second coil,
The flow path is provided inside the plate member,
The non-contact power feeding apparatus according to claim 1, wherein the foreign matter detection unit detects the foreign matter existing on a surface of the plate member.
前記流路は、前記第2のコイルを冷却するための前記冷媒を通し、
前記異物検出手段は、
前記異物が存在しない場合の前記冷媒の温度と前記検出温度との比較により、前記異物を検出する
ことを特徴とする請求項1又は2記載の非接触給電装置。
The flow path passes the refrigerant for cooling the second coil,
The foreign object detection means includes
The non-contact power feeding apparatus according to claim 1, wherein the foreign matter is detected by comparing the temperature of the refrigerant with the detected temperature when the foreign matter is not present.
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